/Engine/Plugins/Runtime/OpenXR/Source/OpenXRHMD/Public/IOpenXRExtensionPlugin.h
Optionally provide a custom render bridge for the OpenXR plugin. Note: this returns a pointer to a new instance allocated with "new". Calling code is responsible for eventually deleting it.
virtual FOpenXRRenderBridge * GetCustomRenderBridge ( XrInstance InInstance )